Improvement in furnaces



W. I. FLAGG. Furnace.-

No. 199,529. Patented Jan. 22, 1878.

N.PETERS. PHOTO-UTHUGRAPNER, WASHINGTON. D C.

, UNI ED STATEs j PATENT OFFICE.

WILLIAM r Aee, on BLOOMINGTON, ILLINOIS.

IMPROYEIYIENZT lN FURNACES.

Specification forming part of Letters Patent ism- 199,529, dated Januaiy 22,1878; application filed September 12, 1877.

To all whom it may concern: Be it known that ,I, WILLIAM F. ,FLAGG, ofBloomington, in the county of McLean,

- and in the vState of Illinois, have invented oerand to the letters ofreference marked thereon,

making a part of this specification.

Figure 1 of the drawings represents a front elevation of my improvedfurnace with part of easing broken away; Fig. 2, a vertical section ofthe same. Figs. 3, 4, and 5 are detail views.

This invention relates to improvements in the class of hot-air furnaces;and the invention consists in the general construction and arrangementof parts, as will be hereinafter fully described.

In the drawings, A represents the ash-pit of my improved furnace, theouter case or jacket being provided with a large door or doors, a,communicating therewith, which enables me to use said furnace inconnection with my improved method of heating and ventilating buildingsfor which a patent was granted to me June 12, 1877, No. 191,952. In saidmethod of heating and ventilating buildf ings the air was drawn from theheated room or rooms to be heated, through foul-air flues, back into thefurnace-room, and the heavier and fouler portions of the air wereexhausted *out of the building through an exhaust-shaft communicatingwith the furnace-room, while thelighter and purer portions of the airwere heated by the pipe, drum, and other radiating heating-surfaces ofthe furnace.

By my present construction of furnace the large ash-pit door or doorswill, when open, supply an exhaust-shaft through the same, the burningfuel, and smoke-pipe of the furnace and the chimney, thereby dispensingwith an auxiliary exhaust-shaft, as in my improved method of heating andventilating buildings.

B represents a convex grate, made in one piece, which obviates thedead-center of the common horizontal grates, whereby the fuel does notreadily burn up, and consequently allowing an accumulation of cindersand ashes, as in my improved construction of grate the dead-center comesnear the surface of the burning fuel.

The grate B is centrally pivoted to the cross-rod G, journaled in thesides of the ashpit A, and said rod G is secured in position by anangular branch rod, 0, and spring-catch b and the spring-catch, whenreleased from contact with the branch rod 0, allows thegrate to betilted, for cleaning out the fire-pot of the furnace. The bottom D ofthe fire-pot is provided with an annular rim surrounding the grate,having two series of holes, d d, the inner series of holes, d, allowingthe air to pass directly into the fire-pot and into the burning fuel,supplying it with air between the corrugations e of the lower section Eof the firepot, while the outer series of holes, 11, admits of thepassage of air direct from the ash-pit into the corrugations e of thelower section of the fire-pot, and thence, through one or more holes, 6,in each corrugation, into the burning fuel, thus making a gas-burner, asthe air passing through the holes of the corrugations makes just so manyjets of flame, which consume smoke, &c.

The lower corrugated section E of the firepot is surrounded with anauxiliary wrought or sheet iron band, E, thus forming a double wall forthe lower section of fire-pot. The insired) are extended or projectedabove .the outside of the circumference of the top section G, therebyincreasing the heating-surface of the furnace, as the farther the fluesor tubes g are removed from the top of said section G the moreheating-surface will be obtained on said top section, the tubes havingthe same amount of heating-surface in any position they may occupy.

The section Grests upon the top of section F, and after said section Gis placed in position the grooved space around and between said sectionsF G is filled with dry sand, which prevents the escape of soot or smoke.The upper portions of the tubes 9 and the large opening h in top ofsection G have also circular sand trenches surrounding them, to receivethe upper portions 9 of the tubes g, communicating with the heating-drumH and the dome I.

The drum H is provided with a series of Vertical air tubes or fiues',13, extending entirely through the drum, and which are arranged betweenthe connecting portions 9 of the heating-tubes g, and said air-tubes i,in connection with the large central opening j in the drum H, and withinwhich the dome I fits, greatly increase the heatingsurface of said drum.The dome I also prevents the top of the firepot from burning out.

J represents the case or jacket surrounding the furnace, which isprovided with the doors a a, communicating, respectively, with theash-pit and fire-pot. K represents the smokeflue of the drum H.

It will be observed that in my improved construction of furnace I havethe following heating-surfaces: The entire fire-pot proper, consistingof the three sections E F G, the eight or more connecting-tubes g, thedome I, and the entire outer surface of drum H, and the inner surface ofthe large central air-flue j, mostly filled with the dome I and theseries of small air-flues i.

It will also be observed that all the heated air, in its passage upward,is confined close to the furnace and heating-surfaces until it escapesthrough any desired number of openings, l, communicating with theconductingpipes leading to the room or rooms to be heated.

I claim as my invention 1. The combination, with the lower corrugatedsection E e of the fire-pot, having holes 0, of the auxiliary wrought orsheet iron band E and rim of the bottom D, provided with the two seriesof holes 11 d, substantially as and for the purpose described.

2. The combination, in a furnace, of the outer case or jacket, havingthe large door or doors a, ash-pit A, lower section D of firepot, havingthe annular perforated rim, corrugated section E, wrought or sheet ironband E, outwardly-flaring section F, section G, connecting heating-tubesg g, drum H, having the series of vertical air-tubes i and centralopening j, and the dome I, the several parts constructed and relativelyarranged substantially as herein shown and described.

In testimony that I claim the foregoing I have hereunto set myhand this4th day of September, 1877.

WM. F. FLAGG.

Witnesses: v

THOS. SLADE, RANDOLPH A. PIKE.

